Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0a7e90d0ae958f…

MALICIOUS

PDF

101.5 KB Created: 2021-01-15 05:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 849868d51bd1ea223d194dd8a53a4345 SHA-1: 2a7f6a9279f2742d8220fecb9fbb416b06ca1d78 SHA-256: db0a7e90d0ae958f6b3b5742fa481660ccaf06468008e5b04c662aa87abc7d3e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable hosting, with one specifically identified as a known malicious redirector. This strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the heuristic firings indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/aws?utm_term=rmlauexams.+in+private+form In PDF document text
    • https://site-1175458.mozfiles.com/files/1175458/radiant_church_richland_at_the_movies.pdfIn PDF document text
    • https://site-1215232.mozfiles.com/files/1215232/vakagokibusimonozi.pdfIn PDF document text
    • https://cdn.sqhk.co/wixadigizal/hdMCQjd/endless_highway_the_music_of_the_band_download.pdfIn PDF document text
    • https://site-1174172.mozfiles.com/files/1174172/red_ball_1_volume_1.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/id8ghhj/kitten_birthday_cards_free_images.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_5fc2a7b787223.pdfIn PDF document text
    • https://site-1244917.mozfiles.com/files/1244917/discovery_channel_school_s_puzzlemaker_answer_key.pdfIn PDF document text
    • https://site-1172267.mozfiles.com/files/1172267/mogamomajubiponufu.pdfIn PDF document text
    • https://site-1171656.mozfiles.com/files/1171656/captions_for_instagram_for_girls.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/idjeIia/clover_dating_app_login.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/game_boy_classic_games.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F6 5216 bytes
SHA-256: 632c33cf8a2ec57c2116cb7b04d6b7456d5222e8dac2345f8262a7b3e35ae84f
font_01_sfnt_off00014ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA9 12204 bytes
SHA-256: 5870d8d5c0d139335b96ed9c680d7aa55515a3efaaffd74f0cbd916052db17ab
font_02_sfnt_off0001746c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1746C 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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